What adjective would best describe a conversation that is clever and amusing?

The adjective "wry" captures the essence of a conversation that is clever and amusing because it refers to a form of humor that is dry and often involves a subtle or sarcastic twist. Wry humor typically showcases an intelligent wit that can provoke both laughter and reflection, making it a perfect fit for conversations that are not just entertaining but also showcase intellectual depth.

The other options do not convey the same meaning. "Vociferous" pertains to being loud or vocal, which does not necessarily imply cleverness or amusement in a conversation. "Verbosity" refers to the quality of using more words than needed, which often detracts from clarity and humor. "Vivid" describes something that is bright, intense, or striking and is usually about imagery rather than conversation's cleverness or humor. Thus, "wry" is the most appropriate choice to describe a conversation characterized by cleverness and amusement.